Drilling machine



FIG. 1 is a front elevational view of a drilling machine showing our new design;

FIG. 2 is a rear elevational view;

FIG. 3 is an end elevational view taken from the left of FIG. 1;

FIG. 4 is an end elevational view taken from the right of FIG. 1;

FIG. 5 is a top plan view;

FIG. 6 is a bottom plan view;

FIG. 7 is a perspective view thereof. 

The ornamental design for a drilling machine, substantially as shown. 